To create a green screen, open up the program Sony Vegas. Now go to media generators. On the left hand side of your screen there should be a list with the link solid color right in the middle. Click on that and a menu with a variety of different colored boxes will appear. Double click on green. A menu will pop up so that you can adjust the shade of green just by moving the vertical line to the left or right. After choosing the appropriate shade, save the green box as either a video or picture and burn that onto a DVD or CD. Now you can put it in your DVD player and pause it so that you have a green screen on your TV.